Gwent's Police and Crime Commissioner and Gwent Police's former chief constable will appear before the Home Affairs Select Committee in London later.
Both parties will give their side of events that led to Mrs Napier's departure at the meeting in Westminister this afternoon.
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It will be a fine, warm and rather humid day with plenty of sunny spells around.
Gwent Police are appealing for information after a Rugby League player was found seriously injured.
Homes on one of the UK's most polluted streets could be demolished in an effort to improve air quality.